Prove that the following set form a group with addition as the operation: {0,5,10,15}

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter7: Real And Complex Numbers
Section7.3: De Moivre’s Theorem And Roots Of Complex Numbers
Problem 19E
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Prove that the following set form a group with addition as the operation:

{0,5,10,15}

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